Virtual Host
 

I'm installing jffnms. Near the end of the instructions it says configure apache as follows:

1. As a virtual Host

<VirtualHost *>
ServerAdmin you@yournet.com
DocumentRoot /opt/jffnms/htdocs
ServerName nms.yournet.com
LimitRequestLine 20000
</VirtualHost>

I don't know what the mean in the first part <VirtualHost *>

I already have apache installed but I need to make the above change

You have to configure it for the application your installing that apparently wants its own virtual host in apache.